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• The general idea behind Diffie-Hellman is that Alice and Bob each start with a publicly known common color and a secret color.
• Communications using Diffie-Hellman all by itself are vulnerable to man in the middle attacks.
• Diffie-Hellman is well suited for use in data communication but is less often used for data stored or archived over long periods of time.
• Diffie-Hellman works on the principle of not sharing the encryption key over the wire completely.
• Diffie-Hellman is a key agreement algorithm used by two parties to agree on a shared secret.
• The Diffie-Hellman key exchange is a cryptographic protocol for exchanging cryptographic keys over a public channel.
• Alice and Bob agree to use the prime number \(p=17\) and the generator \(g=5\) for their Diffie-Hellman key exchange.
• The Diffie-Hellman key exchange uses large numbers and a lot of computations for cryptography.
• With the Diffie-Hellman key exchange, both parties get the same result, without sending the shared secret across the communication channel.
• The Diffie-Hellman key exchange is implemented in multiple ways.
• Static Diffie-Hellman Key Exchange – Static Diffie-Hellman uses certificates for authenticating the server.
• Diffie-Hellman uses modular exponentiation, which is also known as repeated sequence algorithm.
• First, let’s look at why we need Diffie-Hellman (DH) key exchange in the first place.
• The Diffie-Hellman key exchange was the first publicly-used mechanism for solving this problem.
• The main purpose of the Diffie-Hellman key exchange is to securely develop shared secrets that can be used to derive keys.
• Technically, the Diffie-Hellman key exchange can be used to establish public and private keys.
• The Diffie-Hellman key exchange is complex and it can be difficult to get your head around how it works.
• For Diffie-Hellman to be secure, it is desirable to use a prime p with 1024 bits; in base 10 that would be about 308 digits.

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• ID : Q623447